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The price of the book is marked 20% above the C.P. If the marked price of the book is Rs. 180, then what is the cost of the paper used in a single copy of the book?

Rs. 36
Rs. 37.50
Rs. 42
Rs. 44.25

Correct Answer: Rs. 37.50

Explanation:

Clearly, marked price of the book = 120% of C.P.

Also, cost of paper = 25% of C.P

Let the cost of paper for a single book be Rs. n.

Then, 120 : 25 = 180 : n ⟹ n = Rs.	❨	25 x 180	❩	= Rs. 37.50 .
		120

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